How do you write/twitter about bad software you use at work?

I like to write, whether it be via my blog or Twitter. Definitely Twitter more now for the small stuff, and my blog for the infrequent but more thoughtful posts. So at the company I work at, we are in the midst of using a new CMS that was purchased within the last year. It sucks. We were using an old version of Vignette which definitely had its problems, and there was a well-defined need to switch to a new modern system. So we've invested a LOT of money purchasing this proprietary system which, from my perspective as one of 2 front-end developers, is a steaming pile. It seems to work well on the engineering side as far as scalability, but beyond that its really horrible to develop for. So my question is primarily this: I want to blog and/or twitter about my experiences with this. I feel like its a civic, moral duty to be able to share my feelings and warn other developers against making a bad purchasing decision. However, a lot of my friends that I work with (including senior level people who made the purchasing decision) follow me on Twitter and read my blog. Kind of puts me into a precarious position. How do other people handle this situation?